Hi there,
first: thanks for the fix.
And a short notice: since the latest update (2.7.5), the pushback editor acts a bit strange from time to time. Sometimes (not always) you open the editor, and everything is like you can edit the pushback now, but the big green plane symbol isn't there and you're not able to get out of the pushback editor by hitting ENTER. The only way out of this is to restart couatl.
I would say it happens more likely, if you're working on a whole airport and open and close the editors (parking customizer, walkway customizer, pushback customizer) often.
Best wishes